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- // Copyright 2017 Google Inc. All rights reserved.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
- // This file provides a bpfix command-line library
- // TODO(jeffrygaston) should this file be consolidated with bpfmt.go?
- package cmd_lib
- import (
- "bytes"
- "flag"
- "fmt"
- "io"
- "io/ioutil"
- "os"
- "os/exec"
- "path/filepath"
- "github.com/google/blueprint/parser"
- "android/soong/bpfix/bpfix"
- )
- var (
- // main operation modes
- list = flag.Bool("l", false, "list files whose formatting differs from bpfmt's")
- write = flag.Bool("w", false, "write result to (source) file instead of stdout")
- doDiff = flag.Bool("d", false, "display diffs instead of rewriting files")
- )
- var (
- exitCode = 0
- )
- func report(err error) {
- fmt.Fprintln(os.Stderr, err)
- exitCode = 2
- }
- func openAndProcess(filename string, out io.Writer, fixRequest bpfix.FixRequest) error {
- f, err := os.Open(filename)
- if err != nil {
- return err
- }
- defer f.Close()
- return processFile(filename, f, out, fixRequest)
- }
- // If in == nil, the source is the contents of the file with the given filename.
- func processFile(filename string, in io.Reader, out io.Writer, fixRequest bpfix.FixRequest) error {
- // load the input file
- src, err := ioutil.ReadAll(in)
- if err != nil {
- return err
- }
- r := bytes.NewBuffer(append([]byte(nil), src...))
- file, errs := parser.Parse(filename, r, parser.NewScope(nil))
- if len(errs) > 0 {
- for _, err := range errs {
- fmt.Fprintln(os.Stderr, err)
- }
- return fmt.Errorf("%d parsing errors", len(errs))
- }
- // compute and apply any requested fixes
- fixer := bpfix.NewFixer(file)
- file, err = fixer.Fix(fixRequest)
- if err != nil {
- return err
- }
- // output the results
- res, err := parser.Print(file)
- if err != nil {
- return err
- }
- if !bytes.Equal(src, res) {
- // contents have changed
- if *list {
- fmt.Fprintln(out, filename)
- }
- if *write {
- err = ioutil.WriteFile(filename, res, 0644)
- if err != nil {
- return err
- }
- }
- if *doDiff {
- data, err := diff(src, res)
- if err != nil {
- return fmt.Errorf("computing diff: %s", err)
- }
- fmt.Printf("diff %s bpfix/%s\n", filename, filename)
- out.Write(data)
- }
- }
- if !*list && !*write && !*doDiff {
- _, err = out.Write(res)
- }
- return err
- }
- func makeFileVisitor(fixRequest bpfix.FixRequest) func(string, os.FileInfo, error) error {
- return func(path string, f os.FileInfo, err error) error {
- if err == nil && f.Name() == "Android.bp" {
- err = openAndProcess(path, os.Stdout, fixRequest)
- }
- if err != nil {
- report(err)
- }
- return nil
- }
- }
- func walkDir(path string, fixRequest bpfix.FixRequest) {
- filepath.Walk(path, makeFileVisitor(fixRequest))
- }
- func Run() {
- flag.Parse()
- fixRequest := bpfix.NewFixRequest().AddAll()
- if flag.NArg() == 0 {
- if *write {
- fmt.Fprintln(os.Stderr, "error: cannot use -w with standard input")
- exitCode = 2
- return
- }
- if err := processFile("<standard input>", os.Stdin, os.Stdout, fixRequest); err != nil {
- report(err)
- }
- return
- }
- for i := 0; i < flag.NArg(); i++ {
- path := flag.Arg(i)
- switch dir, err := os.Stat(path); {
- case err != nil:
- report(err)
- case dir.IsDir():
- walkDir(path, fixRequest)
- default:
- if err := openAndProcess(path, os.Stdout, fixRequest); err != nil {
- report(err)
- }
- }
- }
- }
- func diff(b1, b2 []byte) (data []byte, err error) {
- f1, err := ioutil.TempFile("", "bpfix")
- if err != nil {
- return
- }
- defer os.Remove(f1.Name())
- defer f1.Close()
- f2, err := ioutil.TempFile("", "bpfix")
- if err != nil {
- return
- }
- defer os.Remove(f2.Name())
- defer f2.Close()
- f1.Write(b1)
- f2.Write(b2)
- data, err = exec.Command("diff", "-u", f1.Name(), f2.Name()).CombinedOutput()
- if len(data) > 0 {
- // diff exits with a non-zero status when the files don't match.
- // Ignore that failure as long as we get output.
- err = nil
- }
- return
- }
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